The rings were custom made. I don’t think you will find one anywhere… but you can still get linkage kits if you want to go that route. There’s no data that shows ring kits are better than linkage kits.

Good point @madgrizzle I wouldn’t mind some feedback if someone has compared - but my intuition is that the rollers on the ring might actually be more likely to bind than the linkage, which would have a bit more leverage, i suspect.

That being said, so far I found this :

IndiaMart.com has these around USD$10 ea, qty30.
(actually called a 5-8 Ilizarov Ring)
But I don’t want to wait for them to come from India, and Stainless Steel is overkill.

I still feel like there is an obvious source that I’m not thinking of…

just get a linkage kit, they are pretty easy to make yourself out of steel bar at hardware store. Just stack the bars up and drill through all of them at once so you know they are the exact same distnaces

if you must get it laser cut send it to keithg222@gmail.com
he has fair prices for low volume and you can bend it in a vice or similar technique. Be aware the U bearings and Shoulder bolts are very expensive. Can’t believe they old sold the kit for $60 with those components. One can use cheaper components and probably have it work, like regular bolts. instead of shoulder bolts.